Problem with position: fixed

Hello,
I have configure FCKeditor to place the toolbar in a div, because I would like to always have FCK at the top of Firefox, when I wrote a long document for exemple.
I have apply this CSS to the div :

#fckeditor{
   position: fixed;
   top:0px;
   width:750px;
}

FCK is now always at the top of the Firefox, but toolbars Style, FontFormat, FontName, FontSize, TextColor and BGColor are fixed at the top of my page :

What can I do ?

PS : sorry about my english